Question

The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is:

• A. 0.4
• B. 0.5
• C. 0.8
• D. 1

Answer 1

The correct option is C 0.8

Given, $Pd=80V,40V,100V$

So power factor is $\frac{v_R}{\sqrt{V_R^2+(V_L^2-V_C^2)}}=\frac{80}{\sqrt{6400+3600}}=\frac{80}{100}=0.8$